Improvement in hypodermic syringes



J. McMORRIES. HYYPODERMIC SYRINGE.

No.187,031. Pitented Feb. 6, 1877.

INVENTUB BY ATTUBNEYS.

- N. PETERS, FHOTO-UTNOGRAPHER. WASHINGTON. D c.

' UNITED STATES FFIGE.

JOSEPH MGMORRIES, OF NEWBERRY, SOUTH CAROLINA.

IMPROVEMENT IN HVPODERMIC SVRINGES.

Specification forming part of Letters Patent No. 187,031, dated February6, 1877; application filed December 30, 1876.

' To all whom it may concern Be it known that I, JOSEPH MCMORRIES, ofNewberry, in the county of Newberry and State of South Carolina, haveinvented a new and Improved Hypodermic Syringe, of which the followingis a specification 1n the accompanying drawing, Figure 1 represents avertical transverse section of my improved hypodermic syringe, taken online y 3 Fig. 2, and Fig. 2 is a horizontal section sists of a syringewith hollow plunger-rod for guiding the needle-rod, both rods beingconnected to spring-acted plunger-rods of tubular side casings, andretained by springacted triggers, to be simultaneously released forjointly entering the skin and injecting the liquid.

In the drawing, A represents a syringe of the usual construction, whichdraws in the liquid to be injected in the customary manner by atightly-fitting plunger, B. The plunger-rod B is made hollow, to be usedas a guide for the needle-rod O, sliding therein. A second plunger, 0',at the end of the needle-rod O, keeps the syringe closed, while theliquid is drawn by the plunger B, the same entering through a spout, a,and perforation or channel 11.

The needle D is screwed by a threaded socket or cap onto the spout a,and made in the customary manner witha longitudinal perforation anddischarge orifice back of the needle-point.

The outer ends of the plunger and needlerods B and G are connected bylateral bars or handle pieces 'd, with the notched plungerrods E,thatare guided in symmetrical tubes or casings F, secured in any suitablemanner to the syringe A, and acted upon by spiral springs E, which arepreferably placed between the end disks or plungers of the rods E, andthe upper ends of the casings.

Fulcrumed and spring-acted triggers G are arranged at the upper ends ofthe casings F, for the purpose of engaging the rods E, and thereby,respectively, the plunger and needle-rods of the syringe, when the sameare drawn back, ready for operation.

By releasing the triggers by pressing on the same with the fingers, theneedle and plunger-rods are simultaneously released, and thereby theneedle and injection jointly forced in a sudden and painless manner, bythe action of the springs, into the tissues.

The extent to which the needle is inserted may be regulated byguide-sleeve D, of varying length that is screwed into the lower part ofthe syringe, as shown in Fig. 1. The instrument is operated in thefollowing manner The plunger-rod is first drawn back, and thereby theliquid drawn in through the needle and spout. By means-ofconnectinghandle 01 and plunger-rod E, the spiral spring in thecorresponding casing F is compressed at the same time, and the triggerGr thrown into one of the notches of the rod E, so as to retain plungerB in position. The needle-rod O, and its spring-acted plunger-rod, arenext drawn back and retained in similar manner by the opposite trigger.The guide-sleeve is then screwed to the lower part of the syringe afterthe screw-cap of the same is detached. The instrument is now ready foruse, and operated to force in the needle, and inject the liquid byreleasing triggers G, which produces the joint working of the needle andplunger, and accomplishes the subcutaneous injection in quick and nearlypainless manner,

Having thus described my invention, I claim as new and desire to secureby Letters Patent A hypodermic syringe for subcutaneous injections,constructed of a syringe having a plunger with hollow rod and aneedle-rod sliding therein, in combination with guided, notched, andspring-acted rods, connected, respectively, to plunger and needle-rods,and with spring-acted triggers for locking the same, so as to throwsimultaneously the neodle, and inject the liquid on releasing thetriggers, substantially as and for the purpose set orth.

JOSEPH MGMORRIES, M. D.

Witnesses A. P. PIPER, A. S. MOMORRIES.

